I can agree to revert 66c1ca019078220dc1bf968f2bb18421100ef147, since Idon't have a clean fix for this. Pushing down fb_info->lock infb_set_var() excluding to call fb_notifier_call_chain with fb_info->lockheld doesn't seem to be so trivial...

However, reverting this will re-introduce the circular lockingdependency fb_info->lock => mm->mmap_sem => fb_info->lock.